The F-1 Firearms Low Mass DuraBolt Black direct impingement full auto rated M16/M4 bolt carrier group, is known for less reciprocating mass contributing to a less felt recoil. For use in AR15 platforms, is compatible with MIL-SPEC receivers and...

The F-1 Firearms DuraBolt direct impingement full auto rated M16/M4 bolt carrier group, for use in AR15 platforms, is compatible with MIL-SPEC receivers and associated components. The bolt carrier and bolt are ground after heat treat to ensure tolerances...